Please submit this homework as an R Markdown (Rmd) file. See the introduction to Problem Set 1 if you need more information about the Rmd format.
Your file should use the following naming scheme
[last name]_ENS623_SP18_PS8.Rmd
For example,
Lammens_ENS623_SP18_PS8.Rmd
For this problem set, use the iris dataset that comes with R to answer the following questions. As a reminder, you can ‘load’ the iris dataset using the following command:
data(iris)Calculate the mean, standard deviation, and standard error of the mean for both Sepal Length and Sepal Width for the full iris dataset AND for each species separately. In words, describe the differences you observe between the individual species, and between the individual species and the full dataset.
Construct boxplots for both Sepal Length and Sepal Width using the iris dataset. Both the Logan and Quinn & Keough texts provide extensive information on boxplots. You can use base R or ggplot2. See this site for a good outline of constructing a boxplot with ggplot2. Describe each component of a generic boxplot, and describe why we might be interested in each value that is represented.
For both Sepal Length and Sepal Width carry out a t-test between each pair-wise comparison of species (i.e., there should be three tests each for Sepal Length and Width). Show the results of these tests.
In words, briefly describe the results of your analysis.